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International Conference on control, automation, Robotics & Vision

作者： I A Hameed A la Cour-Harbo K D Hansen Aalborg University Faculty of Engineering and Science Dept. of Electronic Systems Section of Automation and Control Fredrik Bajers Vej 7C 9220 Aalborg Denmark

ISBN: (纸本)9781479952007

Conventional agricultural fields are sprayed uniformly to control weeds, insects, and diseases. To reduce cultivation expenses, to produce healthier food and to create more environmentally friendly farms, chemicals should only be applied to the right place at the right time and exactly with the right amount. In this article, a task and motion planning for a team of autonomous vehicles to reduce chemicals in farming is presented. Field data are collected by small unmanned helicopters equipped with a range of sensors, including multispectral and thermal cameras. Data collected are transmitted to a ground station to be analyzed and triggers aerial and ground-based vehicles to start close inspection and/or plant/weed treatment in specified areas. A complete trajectory is generated to enable ground-based vehicle to visit infested areas and start chemical/mechanical weed treatment.

关键词： path planning turning trajectory motion control ASETA

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A supervisory control approach in economic MPC design for refrigeration systems

A supervisory control approach in economic MPC design for re...

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European control Conference (ECC)

作者： Seyed Ehsan Shafiei Jakob Stoustrup Henrik Rasmussen Section for Automation and Control Aalborg University Aalborg Denmark

ISBN: (纸本)9781479901890

A model predictive control at supervisory level is proposed for refrigeration systems including distributed local controllers. Prediction of the electricity price and outdoor temperature are assumed available. The control objective is to minimize the overall energy cost within the prediction horizon. The method is mainly developed for demand-side management in the future smart grid, but a simpler version can be applied in the current electricity market. Due to the system nonlinearity, the minimization is in general a complicated nonconvex optimization problem. A new supervisory control structure as well as an algorithmic pressure control scheme is presented to rearrange the problem to facilitate convex programming. A nonlinear continuous time model validated by real data is employed to simulate the system operation. The results show a considerable economic saving as well as a trade-off between the saving level and the design complexity.

关键词： Compressors Temperature measurement Electricity Refrigerants Valves Economics

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Modeling Supermarket Refrigeration Systems for Supervisory control in Smart Grid

Modeling Supermarket Refrigeration Systems for Supervisory C...

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American control Conference

作者： Seyed Ehsan Shafiei Henrik Rasmussen Jakob Stoustrup Section for Automation and Control Department of Electronic Systems Aalborg University

ISBN: (纸本)9781479901777

A modular modeling approach of supermarket refrigeration systems (SRS) which is appropriate for smart grid control purposes is presented in this paper. Modeling and identification are performed by just knowing the system configuration and measured data disregarding the physical details. So, this approach is extendable to different configurations with different modules. The focus of the work is on estimating the power consumption of the system while estimating the display case temperatures as well. This model can however be employed as a simulation benchmark to develop control methods for SRS regarding their power/energy consumptions in the future smart grids. Moreover, the developed model is validated by real data collected from a supermarket in Denmark. The utilization of the produced model is also illustrated by a simple simulation example.

关键词： Smart grids Supervisory control Power consumption Refrigeration systems observational data EXPANDABLE Modeling control Methods

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A Fault Tolerant Superheat control Strategy for Supermarket Refrigeration Systems

A Fault Tolerant Superheat Control Strategy for Supermarket ...

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Conference on control and Fault-Tolerant Systems

作者： Kasper Vinther Roozbeh Izadi-Zamanabadi Henrik Rasmussen Jakob Stoustrup Section of Automation and Control Department of Electronic Systems Aalborg University

ISBN: (纸本)9781479928569

In this paper, a fault tolerant control (FTC) strategy is proposed for evaporator superheat control in supermarket refrigeration systems. Conventional control uses a pressure and temperature sensor for this purpose, however, the pressure sensor can fail to function. A contingency control strategy, based on a maximum slope-seeking control method and only a single temperature sensor, is developed to drive the evaporator outlet temperature to a level that gives a suitable superheat of the refrigerant. The FTC strategy requires no a priori system knowledge or additional hardware and functions in a plug&play fashion. The strategy is outlined by means of procedural steps as well as a flow chart that also illustrates the process of automatic tuning of the maximum slope-seeking controller. Test results are furthermore presented for a display case in a full scale CO_2 supermarket refrigeration system.

关键词： Refrigeration systems Temperature Sensor Device Component overheat control Self tuning control Methods Fault tolerance Coviracil Pressure Evaporators

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A Decentralized control Method for Direct Smart Grid control of Refrigeration Systems

A Decentralized Control Method for Direct Smart Grid Control...

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IEEE Annual Conference on Decision and control

作者： Seyed Ehsan Shafiei Roozbeh Izadi-Zamanabadi Henrik Rasmussen Jakob Stoustrup Section for Automation and Control Department of Electronic Systems Aalborg University Aalborg Denmark

ISBN: (纸本)9781467357159

A decentralized control method is proposed to govern the electrical power consumption of supermarket refrigeration systems (SRS) for demand-side management in the smart grid. The control structure is designed in a supervisory level to provide desired set-points for distributed level controllers. No model information is required in this method. The temperature limits/constraints are respected. A novel adaptive saturation filter is also proposed to increase the system flexibility in storing and delivering the energy. The proposed control strategy is applied to a simulation benchmark that fairly simulate the CO_2 booster system of a supermarket refrigeration.

关键词： Refrigeration systems control Architecture decentralised control Smart grids electrical power consumption control strategy level controller simulating

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A review of active yaw control system for vehicle handling and stability enhancement

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International Journal of Vehicular Technology 2014年第unknown期2014卷 1-15页

作者： Aripin, M.K. Md Sam, Yahaya Danapalasingam, Kumeresan A. Peng, Kemao Hamzah, N. Ismail, M.F. Control Instrumentation and Automation Department Faculty of Electrical Engineering Universiti Teknikal Malaysia Melaka 76100 Durian Tunggal Melaka Malaysia Department of Control and Mechatronics Faculty of Electrical Engineering Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia Temasek Laboratories National University of Singapore 117411 Singapore 5A Engineering Drive 1 Singapore Faculty of Electrical Engineering UiTM Pulau Pinang 13500 Permatang Pauh Pulau Pinang Malaysia Industrial Automation Section Universiti Kuala Lumpur Malaysia France Institute 43650 Bandar Baru Bangi Selangor Jalan Teras Jernang Malaysia

Yaw stability control system plays a significant role in vehicle lateral dynamics in order to improve the vehicle handling and stability performances. However, not many researches have been focused on the transient performances improvement of vehicle yaw rate and sideslip tracking control. This paper reviews the vital elements for control system design of an active yaw stability control system;the vehicle dynamic models, control objectives, active chassis control, and control strategies with the focus on identifying suitable criteria for improved transient performances. Each element is discussed and compared in terms of their underlying theory, strengths, weaknesses, and applicability. Based on this, we conclude that the sliding mode control with nonlinear sliding surface based on composite nonlinear feedback is a potential control strategy for improving the transient performances of yaw rate and sideslip tracking control. © 2014 M. K. Aripin et al.

关键词： AUTOMOBILES -- Automatic systems DYNAMICAL systems AUTOMOBILES -- Performance COMPARATIVE studies SURFACES (Technology)

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An autonomous robotic system for mapping weeds in fields

An autonomous robotic system for mapping weeds in fields

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8th IFAC Symposium on Intelligent Autonomous Vehicles, IAV 2013

作者： Hansen, Karl D. Garcia-Ruiz, Francisco Kazmi, Wajahat Bisgaard, Morten La Cour-Harbo, Anders Rasmussen, Jesper Andersen, Hans Jørgen Section for Automation and Control Aalborg University Aalborg Denmark Department of Plant and Environmental Sciences/Crop Sciences Copenhagen University Taastrup Denmark Department of Architecture Design and Media Technology Aalborg University Aalborg Denmark

ISBN: (纸本)9783902823366

The ASETA project develops theory and methods for robotic agricultural systems. In ASETA, unmanned aircraft and unmanned ground vehicles are used to automate the task of identifying and treating weeds in sugar beet fields. The framework for a working automatic robotic weeding system is presented along with the implemented computer vision systems. © 2013 IFAC.

关键词： Computer vision

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Predicting faults in wind turbines using SCADA data 51

Predicting faults in wind turbines using SCADA data

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51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

作者： Borchersen, Anders Bech Larseny, Jesper Abildgaard Stoustrupz, Jakob Vattenfall R and D Oldenborggade 25-31 7000 Fredericia Denmark Department of Electronic Systems Section of Automation and Control Aalborg University Frederik Bajers Vej 7C 9220 Aalborg Denmark

ISBN: (数字)9781624101816

ISBN: (纸本)9781624101816

The cost of operation and maintenance of wind turbines is a signi ficant part of the overall cost of wind turbines. To reduce this cost a method for enabling early fault detection is proposed and tested in this paper. The method is taking advantage of the fact that wind turbines in wind farms are located near similar wind turbines. This is done by generating a model for each turbine, the model is then used to evaluate the performance of that turbine and the nearby turbines. The evaluations from the models are then combined and used as votes to identify the faulty turbines. The method is applied and tested on historical Supervisory control And Data Acquisition (SCADA) data from nine operational turbines over a testing period of nine months. The performance of the fault detection is found to be acceptable based on the testing period. During the testing period several gear related services were performed, some of these were predicted by the proposed fault detection systems. The advantage of the purposed method is that it applicable for operational turbines without requiring any extra measurements, since the used SCADA data is available from most modern wind turbines. © 2013 by Anders Bech Borchersen.

关键词： Wind turbines

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New Sufficient LMI Conditions for Static Output Stabilization

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IFAC Proceedings Volumes 2013年第2期46卷 184-189页

作者： Fabiano Daher Adegas Automation and Control Section Dept. of Electronic Systems Aalborg University Fredrik Bajers Vej 7C 9220-DK Denmark

This paper presents new linear matrix inequality (LMI) conditions to the static output feedback stabilization (SOFS) problem. Although the conditions are only sufficient, numerical experiments show excellent success r... 详细信息

关键词： Static output feedback Stabilizability Uncertain linear systems Linear Matrix Inequalities

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Learning/repetitive control for building systems with nearly periodic disturbances

Learning/repetitive control for building systems with nearly...

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European control Conference (ECC)

作者： Kasper Vinther Vikas Chandan Andrew G. Alleyne Section of Automation and Control Aalborg University Denmark Department of Mechanical Science and Engineering University of Illinois Urbana IL USA

ISBN: (纸本)9781479901890

In this paper, learning/repetitive control is proposed for improvement of existing feedback control loops for temperature regulation in buildings. A single zone office building is used as an example, with real weather data for Phoenix Arizona and realistic occupancy load schedules. Simulations have shown a decrease in the average set point tracking error of more than 50%, even without additional energy consumption. This can be achieved in situations where the load disturbances have enough repeatability and a repeatable-to-nonrepeatable ratio can be computed to determine if learning should be used and at which frequencies. Furthermore, the increased tightness in reference tracking could be used to lower energy consumption by moving the reference set point closer to the boundaries of the allowable temperature range.

关键词： Buildings Load modeling Mathematical model Vectors Temperature control Cutoff frequency Meteorology

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